Hydraulic press



Patented Feb. 26, 1929.

DAVID F. BRODERICK, OF NEW YORK, N. Y.

HYDRAULIC PRESS.

' A lication filed December a, 1926. Serial No. 153,519.

My invention relates to hydraulic presses.

The object of niy'invention is to provide an improved press constructionembodying a process for, and means whereby, the packing and rings of ahydraulic press of the character herein described may be soconstructedas to permit the easy removal of the ram packing and the replacement ofsame without the necessity of lifting or re moving the head of thepress.

The type of press to which this invention relates is of the heavyconstruction highpressure type which operates to provide a pressure ofseveral thousand pounds per square inch of area over a surface of fiveor more square feet, and therefore exerting a great tension, fivehundred tons ormore, on the pillars of the press. By reason of thisgreat tension under load, the pillars are made as short as possible toreduce their stretching, and when the ram packing needs to be replacedthe top of the machine must I be lifted or dismounted, and the ram andtable removed before the flange-rings and packing can be removed fromthe press.

This operation requires time and skilled labor and is a source oftrouble since the press is continued in operation beyond the time thatthe packing should be changed, resulting in leaks past the packing andpreventing a sustained pressure of the required degree from being heldin making the matrix for which the press is used.

The present invention overcomes troubles.

Referring to the drawings which form a part of this specification:

Fig. 1 is an elevational view, partly in section, of a hydraulic pressembodying my invention, the ram being shown in its lowest operatingposition.

Fig. 2 is an elevational sectional view these showing the table andpiston disconnected and the table raised to perm1t the removal of thepacking ring and packing.

A, indicates a portion of the base casting having a bore A, which isprovided with a copper lining B, in which is formed a cylinder C. catein said cylinder and its upper end is reduced in diameter and providedwith holes D to receive the inner ends of the pins E, which are of lessdiameter than the holes.

A table F is provided with a bore F on its under side into which thereduced portion of the ram is loosely fitted and held A ram C is fittedto recipro,

The lining B is provided with an annular recess J to serve as astufiing-box, the top of which is flush with the top surface of the baseA. K, indicates the leather packing formed in a ring in the usualmanner. L, indicates a metal gland-ring which fits in the stuifing-boxto hold the packing in position, and L, indicates a flange-ring which isheld in position by stud-bolt and nut construction M. The rings L and Lhave heretofore been made integral for presses of this type. I have madethem as separate units, so that each ring may be removed from the pressthrough a space large enough to permit the thicker ring L to passthrough after the table has been disconnected from the ram and raised toits highest position, and the ram allowed to descend to its lowestposition in .the cylinder,

as illustrated in Figure 2. By thisarrangement I can use very shortpillars and can also remove and replace the packing without removing thehead G from the press, since it is unnecessary to remove either thetable or ram. This is clearly illustrated in Figure 2, the table F beingsupported in its upper position and the ram lowered to its lowestposition, provide a space above the tops of the stud-bolts M and ram C,and under the table, through which the flange-ring L -may be removedlaterally, after which'the ringL may be lifted and removed and then thepacking K may be removed, as will be readily understood. By removing theguide-rods I, one of which is located at each end of the table, by un-.

screwing themfrom the lugs I which are formed integral with the table,the table also may be removed from the press without dismounting thehead G. I

Having thus described my invention, I claim as new:

1. A press of the character described comprising a base having acylinder therein, a head, pillars connecting said base and head, a ramin said cylinder the upper end of which is no greater in diameter thanthe body portion thereof and having a length approximately that of thelength of the cylinder, a table mounted on the ram in separable relationthereto, a stufling-box for said ram, a gland ring and a flange ringmounted below said table, and means for mounted below said table, meansfor holding said flange ring to said base portion, and means for holdingsaid table onto said ram.

3. The construction as set forth in claim 2, and also the following:said means comprising laterally extending pins carried by the table. 1

4. The construction as set forth in claim 2, and also the following: andmeans for supporting the table in an elevated position above the ramcomprising guide rods carried by the table, and sleeves surrounding saidrods supported by said base.

In testimony whereof I afiix my signature.

DAVID F. BRODERICK.

